US Bridges

Township RD over Trib to Cheyenne River

Fair

Pennington County, South Dakota · 0.2 N Imlay · Structure no. 000000052830548

Built
1930
95 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
32 ft
2 main spans
Daily traffic
15
2022 count
Owner
County
County Highway Agency

About this bridge

Township RD over Trib to Cheyenne River is a wood or timber stringer/multi-beam or girder carrying Township RD over Trib to Cheyenne River in Pennington County, South Dakota. It was built in 1930, so it is 95 years old, older than the South Dakota average of 48.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 15 vehicles a day, roughly 2% of them trucks, projected to reach 15 by 2032. The structure is 32 ft (9.8 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesTownship RD
CrossesTrib to Cheyenne River
Location0.2 N Imlay
RouteCounty Highway 0
CountyPennington County
StateSouth Dakota
Coordinates43.72252, -102.39815
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating45.2 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20 + Mod
Structure length32 ft (9.8 m)
Longest span16 ft (4.9 m)
Deck width16 ft (4.9 m)
Roadway width15 ft (4.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2022)
Projected traffic15 by 2032
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Township RD over Trib to Cheyenne River built?

It was built in 1930, making it 95 years old in 2025.

What condition is Township RD over Trib to Cheyenne River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.

How much traffic does Township RD over Trib to Cheyenne River carry?

About 15 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Township RD over Trib to Cheyenne River?

The structure is 32 ft (9.8 m) long with a longest span of 16 ft (4.9 m) and a deck 16 ft wide.

Who owns Township RD over Trib to Cheyenne River?

It is owned by the County Highway Agency.